package com.heima.wemedia.service.impl;

import com.alibaba.fastjson.JSONArray;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.heima.apis.article.IArticleClient;
import com.heima.common.aliyun.GreenImageScan;
import com.heima.common.aliyun.GreenTextScan;
import com.heima.common.tess4j.Tess4jClient;
import com.heima.file.service.FileStorageService;
import com.heima.model.article.dtos.ArticleDto;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.wemedia.pojos.WmChannel;
import com.heima.model.wemedia.pojos.WmNews;
import com.heima.model.wemedia.pojos.WmSensitive;
import com.heima.model.wemedia.pojos.WmUser;
import com.heima.utils.common.SensitiveWordUtil;
import com.heima.wemedia.mapper.WmChannelMapper;
import com.heima.wemedia.mapper.WmNewsMapper;
import com.heima.wemedia.mapper.WmSensitiveMapper;
import com.heima.wemedia.mapper.WmUserMapper;
import com.heima.wemedia.service.WmNewsAutoScanService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
@Transactional
public class WmNewsAutoScanServiceImpl implements WmNewsAutoScanService {

    @Autowired
    private WmNewsMapper wmNewsMapper;

    @Autowired
    private GreenTextScan greenTextScan;

    @Autowired
    private FileStorageService fileStorageService;

    @Autowired
    private GreenImageScan greenImageScan;

    @Autowired
    private IArticleClient articleClient;

    @Autowired
    private WmChannelMapper wmChannelMapper;

    @Autowired
    private WmUserMapper wmUserMapper;

    @Autowired
    private WmSensitiveMapper wmSensitiveMapper;

    @Autowired
    private Tess4jClient tess4jClient;

    /**
     * 自媒体文章审核
     * @param id 文章id
     */
    @Override
    @Async // 标明当前方法是异步方法
    public void autoScanWmNews(Integer id) {
        // 1. 查询文章
        WmNews wmNews = wmNewsMapper.selectById(id);
        if(wmNews == null) throw new RuntimeException("WmNewsAutoScanServiceImpl - 文章不存在");

        // 判断是否是提交提交状态
        if(wmNews.getStatus().equals(WmNews.Status.SUBMIT.getCode())) {

            // 从文章中提取图片和文本内容
            Map<String, Object> textAndImages =  handleTextAndImages(wmNews);

            // 自管理的敏感词过滤
            boolean isSensitive = handleSensitiveScan((String) textAndImages.get("content"), wmNews);
            if(!isSensitive) return;

            // 2. 审核文本
            Boolean isTextScan = handleTextScan((String) textAndImages.get("content"), wmNews);
            if(!isTextScan) return;

            // 3. 审核图片
            boolean isImageScan = handleImageScan((List<String>) textAndImages.get("images"), wmNews);
            if(!isImageScan) return;

            // 4. 保存文章
            ResponseResult responseResult = saveAppArticle(wmNews);
            if(!responseResult.getCode().equals(200)) {
                throw new RuntimeException("WmNewsAutoScanServiceImpl - 文章审核, 保存文章数据失败");
            }

            // 回填article_id
            wmNews.setArticleId((Long) responseResult.getData());
            updateWmNews(wmNews, (short) 9, "审核成功");
        }
    }

    /**
     * 自管理的敏感词过滤
     * @param content
     * @param wmNews
     * @return
     */
    private boolean handleSensitiveScan(String content, WmNews wmNews) {
        boolean flag = true;

        // 1. 获取所有敏感词
        List<WmSensitive> wmSensitives = wmSensitiveMapper.selectList(Wrappers.<WmSensitive>lambdaQuery().select(WmSensitive::getSensitives));
        List<String> sensitiveList = wmSensitives.stream().map(WmSensitive::getSensitives).collect(Collectors.toList());

        // 2. 初始化敏感词库
        SensitiveWordUtil.initMap(sensitiveList);

        // 3. 查询文章是否包含敏感词
        Map<String, Integer> map = SensitiveWordUtil.matchWords(content);
        if(map.size() > 0) {
            flag = false;
            updateWmNews(wmNews, (short)2, "当前文章存在违规内容" + map);
        }

        return flag;
    }

    /**
     * 保存文章
     * @param wmNews
     */
    private ResponseResult saveAppArticle(WmNews wmNews) {

        // 超时3秒测试
        /*try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }*/

        ArticleDto dto = new ArticleDto();
        // 属性拷贝
        BeanUtils.copyProperties(wmNews, dto);

        // 文章布局
        dto.setLayout(wmNews.getType());

        // 频道
        WmChannel wmChannel = wmChannelMapper.selectById(wmNews.getChannelId());
        if(wmChannel != null) dto.setChannelName(wmChannel.getName());

        // 作者
        dto.setAuthorId(wmNews.getUserId().longValue());
        WmUser wmUser = wmUserMapper.selectById(wmNews.getUserId());
        if (wmNews != null) dto.setAuthorName(wmUser.getName());

        // 设置文章id
        if(wmNews.getArticleId() != null) dto.setId(wmNews.getArticleId());

        // 创建时间
        dto.setCreatedTime(new Date());

        ResponseResult responseResult = articleClient.saveArticle(dto);
        return responseResult;
    }

    /**
     * 审核图片
     * @param images
     * @param wmNews
     * @return
     */
    private boolean handleImageScan(List<String> images, WmNews wmNews) {

        boolean flag = true;
        if (images == null || images.size() == 0) return flag;

        // 1. 下载图片 minIO

        // 图片去重
        images = images.stream().distinct().collect(Collectors.toList());

        List<byte[]> imageList = new ArrayList<>();

        try {
            for (String image : images) {
                byte[] bytes = fileStorageService.downLoadFile(image);

                // 图片识别
                // 1. byte[] -> bufferedImage
                ByteArrayInputStream in = new ByteArrayInputStream(bytes);
                BufferedImage bufferedImage = ImageIO.read(in);
                // 2. 图片识别
                String result = tess4jClient.doOCR(bufferedImage);
                // 3. 过滤文字
                boolean isSensitive = handleSensitiveScan(result, wmNews);
                if(!isSensitive) return isSensitive;

                imageList.add(bytes);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }

        // 2. 图片审核
        try {
            Map map = greenImageScan.imageScan(imageList);
            if(map != null) {
                // 审核失败
                if(map.get("suggestion").equals("block")) {
                    flag = false;
                    updateWmNews(wmNews, (short) 2, "当前文件中,存在违规内容");
                }
                // 不确定信息 需要人工审核
                if(map.get("suggestion").equals("review")) {
                    flag = false;
                    updateWmNews(wmNews, (short) 3, "当前文件中,存在不确定内容");
                }
            }
        } catch (Exception e) {
            flag = false;
            e.printStackTrace();
        }
        return flag;
    }

    /**
     * 审核纯文本内容
     * @param content
     * @param wmNews
     * @return
     */
    private Boolean handleTextScan(String content, WmNews wmNews) {

        boolean flag = true;
        if((wmNews.getTitle() + "-" + content).length() == 0) return flag;

        try {
            Map map = greenTextScan.greeTextScan(wmNews.getTitle() + "-" + content);
            if(map != null) {
                // 审核失败
                if(map.get("suggestion").equals("block")) {
                    flag = false;
                    updateWmNews(wmNews, (short) 2, "当前文件中,存在违规内容");
                }
                // 不确定信息 需要人工审核
                if(map.get("suggestion").equals("review")) {
                    flag = false;
                    updateWmNews(wmNews, (short) 3, "当前文件中,存在不确定内容");
                }
            }
        } catch (Exception e) {
            flag = false;
            e.printStackTrace();
        }
        return flag;
    }

    /**
     * 修改文章内容
     * @param wmNews
     * @param status
     * @param reason
     */
    private void updateWmNews(WmNews wmNews, short status, String reason) {
        wmNews.setStatus(status);
        wmNews.setReason(reason);
        wmNewsMapper.updateById(wmNews);
    }

    /**
     * 1. 提取文章内容中的图片和文本
     * 2. 提取文章的封面图片
     * @param wmNews
     * @return
     */
    private Map<String, Object> handleTextAndImages(WmNews wmNews) {

        // 储存纯文本内容
        StringBuilder stringBuilder = new StringBuilder();

        // 储存图片
        List<String> images = new ArrayList<>();

        // 1. 提取文章中内容和图片
        if (StringUtils.isNotBlank(wmNews.getContent())) {
            List<Map> maps = JSONArray.parseArray(wmNews.getContent(), Map.class);
            for (Map map: maps) {
                if (map.get("type").equals("text")) {
                    stringBuilder.append(map.get("value"));
                }
                if (map.get("type").equals("text")) {
                    images.add((String) map.get("image"));
                }
            }
        }

        // 2. 提取文章的封面图片
        if(StringUtils.isNotBlank(wmNews.getImages())) {
            String[] split = wmNews.getImages().split(",");
            images.addAll(Arrays.asList(split));
        }

        // 3. 返回结果
        Map<String, Object> resultMap = new HashMap<>();
        resultMap.put("content", stringBuilder.toString());
        resultMap.put("images", images);
        return resultMap;
    }
}
